Lever hoist



O. E. DOTSON LEVER HOIST Filed March 30, 1953 :F :rgj l Nw., 13, 1956 o.E. Do'rsoN 2,770,339

LEVER` HoIsT Filed March 30, 1955 3 Sheets-Sheet 2 :FFIIQJL 8 Ivg;

IN VEN TOR. Orr/'e E" Do zson A TTO/QNEV O. E. DOTSON LEVER HOIST Nov.13, 1956 3 Sheets-Sheet 3 Filed March 30. 1953 INVE ,Orr/'e E. D0

A ORA/Ev United States Patent O LEVER HOIST Orrie E. Dotson, Lisbon,Ohio, assignor, by mesne assignments, to The Atlas Plastic Mold and BreCompany, Cuyahoga Falls, Ohio Application March 30, 1953, Serial No.345,656'

Claims. (Cl. 192-16) This invention relates to a hoist and moreparticularly to a lever hoist.

The principal object of the invention is the provision 4of a lever hoistcapable of advancing and holding the tensioning element thereof in anydesired degree.

A further object of theinvention` is the provision of a lever hoist ofrelatively simple constructionincorporating a novel clutch and brakemeans.

A still further object of the invention is the provision of a leverhoist of lightweight, compact construction capable of being used fortightening cables and the like.

A still further object of the invention is the provision of a leverhoist which may be easily controlled and operated.

The lever hoist disclosed herein is particularly advantageously employedin lifting various objects relatively short distances and holding thesame in desired position while the article is assembled into a `machineor the like and' wherein it is necessary to exactly control the verticalposition of the article by moving it upwardly or downwardly a fractionof an inch.`

Various Llever hoists heretofore known in the art have had the commonIfailing of inaccurate close adjustment specifically in that the articlebeing lifted or pulled by the lever hoist could not be accuratelyposititioned within the area defined by the spacing of the ratchet teethof the hoist which controlled the braking effect thereof. On thecontrary, in the present invention minute upward or forward adjustmentsmay be made and minute down or backward adjustments are equally easilyaccomplished enabling a most precise location of an article to berealized through the use of the lever hoist.

With the foregoing and other objects in view which will appear as thedescription proceeds, the invention resides in the combination andarrangement of parts and in the details of construction hereinafterdescribed and claimed, it being the invention to cover all changes andmodifications of the example of the invention herein chosen for purposesof the disclosure, which do not constitute departures from the spiritand scope of the invention.

The invention is illustrated in the accompanying drawing, wherein:

Figure 1 is an end View of the lever hoist.

Figure 2 is a side view of the lever hoist.

Figure 3 is an opposite end view of the lever hoist with respect toFigure 1 and with portions broken away.

Figure 4 is an enlarged sectional elevation of the lever hoist.

Figure 5 is a vertical cross section taken on line 5-5 of Figure 4.

IFigure 6 is a vertical cross section taken on line 66 of Figure 4.

Figure 7 is a vertical cross section taken on line 7--7 of Figure 4.

Figure 8 is a vertical cross section taken on line 8 8 of Figure 4.

By referring to the drawings and Figures l, 2 and 3 Mice in particularit will be seen that the lever hoist comprises a body member 10, theinterior of which is hollow and one end 11 of which is of reduceddiameter with the opposite end thereof dened by a plate 12. A circularboss 13 is positioned on the upper portion of the body 10 and receivesahook 14. Openings 15 in the lower portion of the body 10 and beneath thehook 14 provide entrance and-exit passageways for a chain 16, one end ofwhich terminates in a swivel 17 carrying a secondary hook 18.

The reduced end 11` of the body 10 forms a bearing for one end of adriven shaft 19 as may best be seen in Figure 4 of the drawings. Theother end of the driven shaft 19 extends through the plate 12 and isengaged by a nut 20 threaded thereon and by means of which the plate 12is maintained in position on the body 10. An annular ball bearingassembly 21 positioned within the hollow body 10 serves to carry themiddle portion of the driven shaft 19 at a point thereon adjacent asprocket 22 over which the chain 16 is positioned. The chain 16, and thesprocket 22`form the means of conveying motion of the driven shaft 19 tothe article to be moved.

Means for driving the driven shaft 19 comprises a member 23 which `takesthe form of a circular apertured disc with ratchet teeth 24 formed inits periphery. The aperture in the member 23 is provided with a` threadpattern 25 which registers wtih a thread pattern 26 formed on the drivenshaft 19. There is sufficient area within the hollow body 1t! to permitthe member 23 to rotate in limited degree on the thread pattern 26,which action causes it to move from right to left thereon, as seen inFigure 4 of the drawings.

In order that rotating motion may be imparted to the member 23, a handle27 is rotatably mounted on the body member 1t] and retained in suchposition bythe plate 12, heretofore referred to. The handle 27 includes,in addition to the elongated handle portion and circular end sectionpivoting` on the body member 10, a longitudinally movable latch 28spring urged toward the ratchet teeth 24 of the member 23by a coil`spring 2'9 positioned in a cutaway portion 30 of the handle member 27.

The opposite end of `the latch 2ti`has` an odset secondary handle 31thereon as may best be seen in `Figure l of the drawings so' that thelatch 28"may be` rotated `on` its longitudinal axis to move it into andout of engagement with Ithe ratchet teeth 24 on the member 23 and toreverse its effective ratchet-like engagement with said ratchet teeth24.

The longitudinal movement of the latch 28 is occasioned by the presenceof a pair of bosses: 32 on the handle 27 adjacent the secondary 'handle31.

Positioned on the driven shaft 19 between the thread pattern 26 and thebearings 21 there is a sleeve 33 with a cam disc 34 rotatably mountedthereon and'a pair of discs 35 and 36 positioned one each on either sideof the cam disc 34. The cam disc 34 and the discs 3S and 36 on eitherside thereof are positioned adjacent the inner face of the member 23 andso that upon its being moved into engagement with the same by rotationon the thread pattern 26 by the handle 27, it will lock the assemblytogether by frictional engagement against an annular ange 37 on thedriven shaft 19 so that motion imparted to the body member 23 will beconveyed through the fric- -tional engagement of the discs 35, 36 andthe cam disc 34 with the ange 37 of the driven shaft 119 and the drivenshaft 19 thereby revolved.

The cam disc 34 has a plurality of cam slots 38-38 therein with rollers39-39 mounted in the cam slots. The cam slots are arranged as shown inFigure 7 of the drawings to permit the cam disc `to move in only onedirection as movement in the opposite direction causes the rollers 39 tomove outwardly of the cam slots 38-38 and into engagement Wi-th anannular ring 40 which iS mounted within the hollow body member and keyedthereto as by a pin 41.

lIt will thus be seen that the driven shaft 19 with the sprocket 22 maybe moved in one direct-ion by corresponding movement of the member 23 asimparted to it by the handle 27 as the member 23 moves inwardly on thethread pattern 26, engages the discs 34, 3S and 36 and locks themtightly against one another and the flange 37 on the driven shaft 19 toconvey rotary motion of the member 23 to the driven shaft 19 and thesprocket 22. Thus, an article attached to the secondary hook 18 on vthechain 16 will be moved toward the lever hoist in a lifting or tighteningoperation.

The cam disc 34 revolves during this action, the rollers 39 movinginwardly of the cam slots 38 and out of engagement with the annular ring40. Immediately such motion stops, and a reverse or opposite motioncommences, the rollers 39 move outwardly of the cam slots 38 in the Acam`disc 34, engage the annular ring 40 and lock the assembly thus securelyholding the object on the hook 18 in any desired location or degree oftightness.

When it is desired to release the driven shaft 19 so that the sprocket22 will permit the chain 16 to slacken and lower or release tension onan object attached to the hook 18, the secondary. handle 31 on the latch28 is moved to reverse the position of the latch 28 so that the handle27 may be used to move the member 23 away from the cam disc 34 and itsadjacent discs 35 and 36 which will free the same from the driven shaft19 thus leaving the driven shaft 19 free to revolve. As long as thelatch 28 is engaged in the ratchet teeth 24 of the member 23, thereverse motion of the driven shaft 19 will be directly controlledthereby.

If it is desired to permit the chain 16 and the hook 18 thereon to fallfreely or move away freely from the lever hoist, then the latch 28 iscompletely disengaged from the ratchet teeth 24 and the member 23 iscapable of rotating in the hollow body 10 along with the driven shaft19.

It will thus be seen that the several objec-ts of the invention are metby the lever hoist disclosed herein.

Having thus described my invention, what I claim is:

l1. In a lever hoist, a hollow body member having oppositely disposedaligned openings, a driven shaft located therein and journaled thereinmidway between said openmgs and in one of said openings a sprocket andan annular flange secured to said driven shaft and a thread' patternformed on said driven shaft, said sprocket, annular llange and threadpattern positioned in spaced relation to one another, a cam discrotatably positioned on said driven shaft between said annular flangeand said thread pattern, and a secondary body member engaged on saidthread pattern, an annular ring within said rst mentioned body memberabout said cam disc and spaced with respect thereto, a plurality of camslots formed in the periphery of said disc and a plurality of rollerslocated one in each of said cam slots for engagement with said annularring when moved in one direction, means for rotating said secondary bodymember, said secondary body member being capable of limited rotation onsaid thread pattern on said driven shaft to engage said cam disc andmove the same against said annular flange to move the driven shaft andsprocket in another direction.

2. The improvements in a lever hoist set forth in claim 1 wherein one ofthe oppositely disposed aligned openings in the body member is providedwith'an apertured cap, the driven shaft extending through the aperturedcap and wherein a secondary thread pattern is formed on the driven shaftand a nut engaged on said secondary thread pattern to `secure the saidapertured cap to the assembly.

3. The `improvements in a lever hoist set forth in claim 1 wherein themeans for rotating the secondary body member comprise a plurality ofteeth formed in the periphery of said secondary body member and a handlewith a ratchet rotatably mounted on said body member and selectivelyengageable with said teeth.

4. The improvements in a lever hoist set forth in claim l wherein theannular llange and the sprocket are separate members provided withkeyways and wherein said driven shaft is provided with a keyway and akey is positioned in said keyways to position said annular flange andsprocket in non-rotatable relation to said driven shaft.

5. The improvements in a lever hoist set forth in claim l wherein theannular ringl about said cam disc is formed as la separate elementsecured in said body member against rotation.

References Cited in the file of this patent UNITED STATES PATENTS1,919,754 Sejersen July 25, 1933 2,083,954 Kessler June 15, 19372,403,462 Schroeder July 9, 1946 2,453,581 Moore Nov. 9, 1948

